“An extremely useful concept [] popular among startup founders is what [] entrepreneur and investor Marc Andreessen calls “product/market fit”, which he defines as “being in a good market with a product that can satisfy that market”. Andreessen argues persuasively that product/market fit is “the only thing that matters for a new startup” and that “the life of any startup can be divided into two parts: before product/market fit and after product/market fit.”

But it takes time to reach product/market fit. [] [Dixon believes that] the best predictor of whether a startup will achieve product/market fit is whether there is [] “founder/market fit” [meaning] founders have a deep understanding of [their market], and are people who “personify their product, business and ultimately their company.”” Chris Dixon, Founder/market fit, June 19, 2011; http://cdixon.org/2011/06/19/foundermarket-fit/